Non-equiblirium growth behavior of interface migrated with solute segregation
| Project/Area Number |
19H02473
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Tohoku University |
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Principal Investigator |
Miyamoto Goro 東北大学, 金属材料研究所, 准教授 (60451621)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Keywords | 相変態 / エネルギー散逸 / ソリュートドラッグ / 偏析 / 三次元アトムプローブ / 界面整合性 / 異相界面 / 分配 / 非平衡成長 / 非平衡静養 |
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| Outline of Research at the Start |
本研究では，移動する異相界面への溶質元素偏析によって引き起こされる非平衡状態を定量的かつ系統的に測定し，溶質元素－異相界面の相互作用のダイナミクスを確立することを目指す．その要諦は，異相界面移動の制御に不可欠であるがこれまで推測するしかなかった溶質偏析に関する種々の因子（異相界面における界面整合性，溶質元素の偏析エネルギー，偏析幅，溶質元素の界面拡散係数や溶質元素間の相互作用）を同一界面における非平衡度，成長速度，元素偏析量といった多面解析によって解明することである．
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| Outline of Final Research Achievements |
In order to control the phase transformation microstructure that develops during heat treatment of steels, the effects of Mo, Mn, and Ni additions on the interfacial migration of interphase boundary were investigated. Mo segregates at the interface and consumes a large amount of energy for interfacial migration, but the effect disappears when the migration velocity is small. On the other hand, Mn consumes a large amount of energy regardless of the interfacial migration velocity and suppresses interfacial migration even at slow interfacial migration velocities. Furthermore, 3DAP analyses reveal the nanoscale elemental enrichment near the interface that causes these energy consumption and it was found that the enrichment behavior differs greatly depending on the interfacial character. A model was developed to quantitatively predict these elements behavior, and a parameterization method was proposed for each interface parameter.
Translated with www.DeepL.com/Translator (free version)
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で明らかになった添加元素と異相界面の相互作用の定量的な理解は、鉄鋼材料を始めとする構造用金属材料の高機能化に資するものであると同時に、少ない添加元素で効率的に相変態挙動を制御することができるようになるため、省資源化にも貢献することが期待される。また、異相界面における添加元素の振る舞いが明確になったことから、これまで想像するしかなかった界面における精緻な元素活用を可能にするものである。
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Report
(4 results)
Research Products
(26 results)
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[Journal Article] Chemical boundary engineering: a new route towards lean, ultrastrong yet ductile steel2020
Author(s)
Ran Ding, Yingjie Yao, Binhan Sun, Geng Liu, Jianguo He, Tong Li, Xinhao Wan, Zongbiao Dai, Dirk Ponge, Dierk Raabe, Chi Zhang, Andy Godfrey, Goro Miyamoto, Tadashi Furuhara, Zhigang Yang, Sybrand van der Zwaag, Hao Chen
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Journal Title
Science Advances
Volume: 6
Issue: 13
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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